Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | kmod, the new module loader (replaces kerneld) | |
3 | Kirk Petersen | |
4 | ||
5 | Reorganized not to be a daemon by Adam Richter, with guidance | |
6 | from Greg Zornetzer. | |
7 | ||
8 | Modified to avoid chroot and file sharing problems. | |
9 | Mikael Pettersson | |
10 | ||
11 | Limit the concurrent number of kmod modprobes to catch loops from | |
12 | "modprobe needs a service that is in a module". | |
13 | Keith Owens <kaos@ocs.com.au> December 1999 | |
14 | ||
15 | Unblock all signals when we exec a usermode process. | |
16 | Shuu Yamaguchi <shuu@wondernetworkresources.com> December 2000 | |
17 | ||
18 | call_usermodehelper wait flag, and remove exec_usermodehelper. | |
19 | Rusty Russell <rusty@rustcorp.com.au> Jan 2003 | |
20 | */ | |
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/sched.h> | |
23 | #include <linux/syscalls.h> | |
24 | #include <linux/unistd.h> | |
25 | #include <linux/kmod.h> | |
1da177e4 | 26 | #include <linux/slab.h> |
1da177e4 | 27 | #include <linux/completion.h> |
17f60a7d | 28 | #include <linux/cred.h> |
1da177e4 | 29 | #include <linux/file.h> |
9f3acc31 | 30 | #include <linux/fdtable.h> |
1da177e4 LT |
31 | #include <linux/workqueue.h> |
32 | #include <linux/security.h> | |
33 | #include <linux/mount.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/init.h> | |
d025c9db | 36 | #include <linux/resource.h> |
8cdd4936 RW |
37 | #include <linux/notifier.h> |
38 | #include <linux/suspend.h> | |
1da177e4 LT |
39 | #include <asm/uaccess.h> |
40 | ||
7ead8b83 LZ |
41 | #include <trace/events/module.h> |
42 | ||
1da177e4 LT |
43 | extern int max_threads; |
44 | ||
45 | static struct workqueue_struct *khelper_wq; | |
46 | ||
17f60a7d EP |
47 | #define CAP_BSET (void *)1 |
48 | #define CAP_PI (void *)2 | |
49 | ||
50 | static kernel_cap_t usermodehelper_bset = CAP_FULL_SET; | |
51 | static kernel_cap_t usermodehelper_inheritable = CAP_FULL_SET; | |
52 | static DEFINE_SPINLOCK(umh_sysctl_lock); | |
53 | ||
a1ef5adb | 54 | #ifdef CONFIG_MODULES |
1da177e4 LT |
55 | |
56 | /* | |
57 | modprobe_path is set via /proc/sys. | |
58 | */ | |
59 | char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe"; | |
60 | ||
61 | /** | |
acae0515 AV |
62 | * __request_module - try to load a kernel module |
63 | * @wait: wait (or not) for the operation to complete | |
bd4207c9 RD |
64 | * @fmt: printf style format string for the name of the module |
65 | * @...: arguments as specified in the format string | |
1da177e4 LT |
66 | * |
67 | * Load a module using the user mode module loader. The function returns | |
68 | * zero on success or a negative errno code on failure. Note that a | |
69 | * successful module load does not mean the module did not then unload | |
70 | * and exit on an error of its own. Callers must check that the service | |
71 | * they requested is now available not blindly invoke it. | |
72 | * | |
73 | * If module auto-loading support is disabled then this function | |
74 | * becomes a no-operation. | |
75 | */ | |
acae0515 | 76 | int __request_module(bool wait, const char *fmt, ...) |
1da177e4 LT |
77 | { |
78 | va_list args; | |
79 | char module_name[MODULE_NAME_LEN]; | |
80 | unsigned int max_modprobes; | |
81 | int ret; | |
82 | char *argv[] = { modprobe_path, "-q", "--", module_name, NULL }; | |
83 | static char *envp[] = { "HOME=/", | |
84 | "TERM=linux", | |
85 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin", | |
86 | NULL }; | |
87 | static atomic_t kmod_concurrent = ATOMIC_INIT(0); | |
88 | #define MAX_KMOD_CONCURRENT 50 /* Completely arbitrary value - KAO */ | |
89 | static int kmod_loop_msg; | |
90 | ||
91 | va_start(args, fmt); | |
92 | ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args); | |
93 | va_end(args); | |
94 | if (ret >= MODULE_NAME_LEN) | |
95 | return -ENAMETOOLONG; | |
96 | ||
dd8dbf2e EP |
97 | ret = security_kernel_module_request(module_name); |
98 | if (ret) | |
99 | return ret; | |
100 | ||
1da177e4 LT |
101 | /* If modprobe needs a service that is in a module, we get a recursive |
102 | * loop. Limit the number of running kmod threads to max_threads/2 or | |
103 | * MAX_KMOD_CONCURRENT, whichever is the smaller. A cleaner method | |
104 | * would be to run the parents of this process, counting how many times | |
105 | * kmod was invoked. That would mean accessing the internals of the | |
106 | * process tables to get the command line, proc_pid_cmdline is static | |
107 | * and it is not worth changing the proc code just to handle this case. | |
108 | * KAO. | |
109 | * | |
110 | * "trace the ppid" is simple, but will fail if someone's | |
111 | * parent exits. I think this is as good as it gets. --RR | |
112 | */ | |
113 | max_modprobes = min(max_threads/2, MAX_KMOD_CONCURRENT); | |
114 | atomic_inc(&kmod_concurrent); | |
115 | if (atomic_read(&kmod_concurrent) > max_modprobes) { | |
116 | /* We may be blaming an innocent here, but unlikely */ | |
117 | if (kmod_loop_msg++ < 5) | |
118 | printk(KERN_ERR | |
119 | "request_module: runaway loop modprobe %s\n", | |
120 | module_name); | |
121 | atomic_dec(&kmod_concurrent); | |
122 | return -ENOMEM; | |
123 | } | |
124 | ||
7ead8b83 LZ |
125 | trace_module_request(module_name, wait, _RET_IP_); |
126 | ||
a06a4dc3 NH |
127 | ret = call_usermodehelper_fns(modprobe_path, argv, envp, |
128 | wait ? UMH_WAIT_PROC : UMH_WAIT_EXEC, | |
129 | NULL, NULL, NULL); | |
130 | ||
1da177e4 LT |
131 | atomic_dec(&kmod_concurrent); |
132 | return ret; | |
133 | } | |
acae0515 | 134 | EXPORT_SYMBOL(__request_module); |
118a9069 | 135 | #endif /* CONFIG_MODULES */ |
1da177e4 | 136 | |
1da177e4 LT |
137 | /* |
138 | * This is the task which runs the usermode application | |
139 | */ | |
140 | static int ____call_usermodehelper(void *data) | |
141 | { | |
142 | struct subprocess_info *sub_info = data; | |
17f60a7d | 143 | struct cred *new; |
1da177e4 LT |
144 | int retval; |
145 | ||
1da177e4 LT |
146 | spin_lock_irq(¤t->sighand->siglock); |
147 | flush_signal_handlers(current, 1); | |
1da177e4 LT |
148 | spin_unlock_irq(¤t->sighand->siglock); |
149 | ||
150 | /* We can run anywhere, unlike our parent keventd(). */ | |
1a2142af | 151 | set_cpus_allowed_ptr(current, cpu_all_mask); |
1da177e4 | 152 | |
b73a7e76 JE |
153 | /* |
154 | * Our parent is keventd, which runs with elevated scheduling priority. | |
155 | * Avoid propagating that into the userspace child. | |
156 | */ | |
157 | set_user_nice(current, 0); | |
158 | ||
a06a4dc3 NH |
159 | if (sub_info->init) { |
160 | retval = sub_info->init(sub_info); | |
161 | if (retval) | |
162 | goto fail; | |
163 | } | |
164 | ||
17f60a7d EP |
165 | retval = -ENOMEM; |
166 | new = prepare_kernel_cred(current); | |
167 | if (!new) | |
168 | goto fail; | |
169 | ||
170 | spin_lock(&umh_sysctl_lock); | |
171 | new->cap_bset = cap_intersect(usermodehelper_bset, new->cap_bset); | |
172 | new->cap_inheritable = cap_intersect(usermodehelper_inheritable, | |
173 | new->cap_inheritable); | |
174 | spin_unlock(&umh_sysctl_lock); | |
175 | ||
176 | commit_creds(new); | |
177 | ||
d7627467 DH |
178 | retval = kernel_execve(sub_info->path, |
179 | (const char *const *)sub_info->argv, | |
180 | (const char *const *)sub_info->envp); | |
1da177e4 LT |
181 | |
182 | /* Exec failed? */ | |
a06a4dc3 | 183 | fail: |
1da177e4 LT |
184 | sub_info->retval = retval; |
185 | do_exit(0); | |
186 | } | |
187 | ||
0ab4dc92 JF |
188 | void call_usermodehelper_freeinfo(struct subprocess_info *info) |
189 | { | |
190 | if (info->cleanup) | |
a06a4dc3 | 191 | (*info->cleanup)(info); |
0ab4dc92 JF |
192 | kfree(info); |
193 | } | |
194 | EXPORT_SYMBOL(call_usermodehelper_freeinfo); | |
195 | ||
1da177e4 LT |
196 | /* Keventd can't block, but this (a child) can. */ |
197 | static int wait_for_helper(void *data) | |
198 | { | |
199 | struct subprocess_info *sub_info = data; | |
200 | pid_t pid; | |
1da177e4 | 201 | |
7d642242 ON |
202 | /* If SIGCLD is ignored sys_wait4 won't populate the status. */ |
203 | spin_lock_irq(¤t->sighand->siglock); | |
204 | current->sighand->action[SIGCHLD-1].sa.sa_handler = SIG_DFL; | |
205 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
206 | |
207 | pid = kernel_thread(____call_usermodehelper, sub_info, SIGCHLD); | |
208 | if (pid < 0) { | |
209 | sub_info->retval = pid; | |
210 | } else { | |
7d642242 | 211 | int ret = -ECHILD; |
1da177e4 LT |
212 | /* |
213 | * Normally it is bogus to call wait4() from in-kernel because | |
214 | * wait4() wants to write the exit code to a userspace address. | |
215 | * But wait_for_helper() always runs as keventd, and put_user() | |
216 | * to a kernel address works OK for kernel threads, due to their | |
217 | * having an mm_segment_t which spans the entire address space. | |
218 | * | |
219 | * Thus the __user pointer cast is valid here. | |
220 | */ | |
111dbe0c BS |
221 | sys_wait4(pid, (int __user *)&ret, 0, NULL); |
222 | ||
223 | /* | |
224 | * If ret is 0, either ____call_usermodehelper failed and the | |
225 | * real error code is already in sub_info->retval or | |
226 | * sub_info->retval is 0 anyway, so don't mess with it then. | |
227 | */ | |
228 | if (ret) | |
229 | sub_info->retval = ret; | |
1da177e4 LT |
230 | } |
231 | ||
d47419cd | 232 | complete(sub_info->complete); |
1da177e4 LT |
233 | return 0; |
234 | } | |
235 | ||
236 | /* This is run by khelper thread */ | |
65f27f38 | 237 | static void __call_usermodehelper(struct work_struct *work) |
1da177e4 | 238 | { |
65f27f38 DH |
239 | struct subprocess_info *sub_info = |
240 | container_of(work, struct subprocess_info, work); | |
86313c48 | 241 | enum umh_wait wait = sub_info->wait; |
d47419cd | 242 | pid_t pid; |
1da177e4 LT |
243 | |
244 | /* CLONE_VFORK: wait until the usermode helper has execve'd | |
245 | * successfully We need the data structures to stay around | |
246 | * until that is done. */ | |
d47419cd | 247 | if (wait == UMH_WAIT_PROC) |
1da177e4 LT |
248 | pid = kernel_thread(wait_for_helper, sub_info, |
249 | CLONE_FS | CLONE_FILES | SIGCHLD); | |
250 | else | |
251 | pid = kernel_thread(____call_usermodehelper, sub_info, | |
252 | CLONE_VFORK | SIGCHLD); | |
253 | ||
86313c48 JF |
254 | switch (wait) { |
255 | case UMH_NO_WAIT: | |
d47419cd | 256 | call_usermodehelper_freeinfo(sub_info); |
86313c48 | 257 | break; |
a98f0dd3 | 258 | |
86313c48 JF |
259 | case UMH_WAIT_PROC: |
260 | if (pid > 0) | |
261 | break; | |
86313c48 | 262 | /* FALLTHROUGH */ |
86313c48 | 263 | case UMH_WAIT_EXEC: |
04b1c384 ON |
264 | if (pid < 0) |
265 | sub_info->retval = pid; | |
1da177e4 | 266 | complete(sub_info->complete); |
86313c48 | 267 | } |
1da177e4 LT |
268 | } |
269 | ||
ccd4b65a RW |
270 | /* |
271 | * If set, call_usermodehelper_exec() will exit immediately returning -EBUSY | |
272 | * (used for preventing user land processes from being created after the user | |
273 | * land has been frozen during a system-wide hibernation or suspend operation). | |
274 | */ | |
275 | static int usermodehelper_disabled; | |
276 | ||
277 | /* Number of helpers running */ | |
278 | static atomic_t running_helpers = ATOMIC_INIT(0); | |
279 | ||
280 | /* | |
281 | * Wait queue head used by usermodehelper_pm_callback() to wait for all running | |
282 | * helpers to finish. | |
283 | */ | |
284 | static DECLARE_WAIT_QUEUE_HEAD(running_helpers_waitq); | |
285 | ||
286 | /* | |
287 | * Time to wait for running_helpers to become zero before the setting of | |
288 | * usermodehelper_disabled in usermodehelper_pm_callback() fails | |
289 | */ | |
290 | #define RUNNING_HELPERS_TIMEOUT (5 * HZ) | |
291 | ||
1bfcf130 RW |
292 | /** |
293 | * usermodehelper_disable - prevent new helpers from being started | |
294 | */ | |
295 | int usermodehelper_disable(void) | |
8cdd4936 | 296 | { |
ccd4b65a RW |
297 | long retval; |
298 | ||
1bfcf130 RW |
299 | usermodehelper_disabled = 1; |
300 | smp_mb(); | |
301 | /* | |
302 | * From now on call_usermodehelper_exec() won't start any new | |
303 | * helpers, so it is sufficient if running_helpers turns out to | |
304 | * be zero at one point (it may be increased later, but that | |
305 | * doesn't matter). | |
306 | */ | |
307 | retval = wait_event_timeout(running_helpers_waitq, | |
ccd4b65a RW |
308 | atomic_read(&running_helpers) == 0, |
309 | RUNNING_HELPERS_TIMEOUT); | |
1bfcf130 RW |
310 | if (retval) |
311 | return 0; | |
8cdd4936 | 312 | |
1bfcf130 RW |
313 | usermodehelper_disabled = 0; |
314 | return -EAGAIN; | |
315 | } | |
316 | ||
317 | /** | |
318 | * usermodehelper_enable - allow new helpers to be started again | |
319 | */ | |
320 | void usermodehelper_enable(void) | |
321 | { | |
322 | usermodehelper_disabled = 0; | |
8cdd4936 RW |
323 | } |
324 | ||
a144c6a6 RW |
325 | /** |
326 | * usermodehelper_is_disabled - check if new helpers are allowed to be started | |
327 | */ | |
328 | bool usermodehelper_is_disabled(void) | |
329 | { | |
330 | return usermodehelper_disabled; | |
331 | } | |
332 | EXPORT_SYMBOL_GPL(usermodehelper_is_disabled); | |
333 | ||
ccd4b65a RW |
334 | static void helper_lock(void) |
335 | { | |
336 | atomic_inc(&running_helpers); | |
337 | smp_mb__after_atomic_inc(); | |
338 | } | |
339 | ||
340 | static void helper_unlock(void) | |
341 | { | |
342 | if (atomic_dec_and_test(&running_helpers)) | |
343 | wake_up(&running_helpers_waitq); | |
344 | } | |
ccd4b65a | 345 | |
1da177e4 | 346 | /** |
0ab4dc92 | 347 | * call_usermodehelper_setup - prepare to call a usermode helper |
61df47c8 RD |
348 | * @path: path to usermode executable |
349 | * @argv: arg vector for process | |
350 | * @envp: environment for process | |
ac331d15 | 351 | * @gfp_mask: gfp mask for memory allocation |
0ab4dc92 | 352 | * |
61df47c8 | 353 | * Returns either %NULL on allocation failure, or a subprocess_info |
0ab4dc92 JF |
354 | * structure. This should be passed to call_usermodehelper_exec to |
355 | * exec the process and free the structure. | |
356 | */ | |
ac331d15 KM |
357 | struct subprocess_info *call_usermodehelper_setup(char *path, char **argv, |
358 | char **envp, gfp_t gfp_mask) | |
0ab4dc92 JF |
359 | { |
360 | struct subprocess_info *sub_info; | |
ac331d15 | 361 | sub_info = kzalloc(sizeof(struct subprocess_info), gfp_mask); |
0ab4dc92 JF |
362 | if (!sub_info) |
363 | goto out; | |
364 | ||
365 | INIT_WORK(&sub_info->work, __call_usermodehelper); | |
366 | sub_info->path = path; | |
367 | sub_info->argv = argv; | |
368 | sub_info->envp = envp; | |
0ab4dc92 JF |
369 | out: |
370 | return sub_info; | |
371 | } | |
372 | EXPORT_SYMBOL(call_usermodehelper_setup); | |
373 | ||
0ab4dc92 | 374 | /** |
a06a4dc3 | 375 | * call_usermodehelper_setfns - set a cleanup/init function |
0ab4dc92 JF |
376 | * @info: a subprocess_info returned by call_usermodehelper_setup |
377 | * @cleanup: a cleanup function | |
a06a4dc3 NH |
378 | * @init: an init function |
379 | * @data: arbitrary context sensitive data | |
380 | * | |
381 | * The init function is used to customize the helper process prior to | |
382 | * exec. A non-zero return code causes the process to error out, exit, | |
383 | * and return the failure to the calling process | |
0ab4dc92 | 384 | * |
a06a4dc3 | 385 | * The cleanup function is just before ethe subprocess_info is about to |
0ab4dc92 JF |
386 | * be freed. This can be used for freeing the argv and envp. The |
387 | * Function must be runnable in either a process context or the | |
388 | * context in which call_usermodehelper_exec is called. | |
389 | */ | |
a06a4dc3 NH |
390 | void call_usermodehelper_setfns(struct subprocess_info *info, |
391 | int (*init)(struct subprocess_info *info), | |
392 | void (*cleanup)(struct subprocess_info *info), | |
393 | void *data) | |
0ab4dc92 JF |
394 | { |
395 | info->cleanup = cleanup; | |
a06a4dc3 NH |
396 | info->init = init; |
397 | info->data = data; | |
0ab4dc92 | 398 | } |
a06a4dc3 | 399 | EXPORT_SYMBOL(call_usermodehelper_setfns); |
0ab4dc92 | 400 | |
0ab4dc92 JF |
401 | /** |
402 | * call_usermodehelper_exec - start a usermode application | |
403 | * @sub_info: information about the subprocessa | |
1da177e4 | 404 | * @wait: wait for the application to finish and return status. |
a98f0dd3 AK |
405 | * when -1 don't wait at all, but you get no useful error back when |
406 | * the program couldn't be exec'ed. This makes it safe to call | |
407 | * from interrupt context. | |
1da177e4 LT |
408 | * |
409 | * Runs a user-space application. The application is started | |
410 | * asynchronously if wait is not set, and runs as a child of keventd. | |
411 | * (ie. it runs with full root capabilities). | |
1da177e4 | 412 | */ |
0ab4dc92 | 413 | int call_usermodehelper_exec(struct subprocess_info *sub_info, |
86313c48 | 414 | enum umh_wait wait) |
1da177e4 | 415 | { |
60be6b9a | 416 | DECLARE_COMPLETION_ONSTACK(done); |
78468033 | 417 | int retval = 0; |
1da177e4 | 418 | |
ccd4b65a | 419 | helper_lock(); |
78468033 | 420 | if (sub_info->path[0] == '\0') |
0ab4dc92 | 421 | goto out; |
1da177e4 | 422 | |
8cdd4936 | 423 | if (!khelper_wq || usermodehelper_disabled) { |
0ab4dc92 JF |
424 | retval = -EBUSY; |
425 | goto out; | |
426 | } | |
a98f0dd3 | 427 | |
a98f0dd3 | 428 | sub_info->complete = &done; |
a98f0dd3 AK |
429 | sub_info->wait = wait; |
430 | ||
431 | queue_work(khelper_wq, &sub_info->work); | |
78468033 NC |
432 | if (wait == UMH_NO_WAIT) /* task has freed sub_info */ |
433 | goto unlock; | |
1da177e4 | 434 | wait_for_completion(&done); |
a98f0dd3 | 435 | retval = sub_info->retval; |
0ab4dc92 | 436 | |
78468033 | 437 | out: |
0ab4dc92 | 438 | call_usermodehelper_freeinfo(sub_info); |
78468033 | 439 | unlock: |
ccd4b65a | 440 | helper_unlock(); |
a98f0dd3 | 441 | return retval; |
1da177e4 | 442 | } |
0ab4dc92 | 443 | EXPORT_SYMBOL(call_usermodehelper_exec); |
1da177e4 | 444 | |
17f60a7d EP |
445 | static int proc_cap_handler(struct ctl_table *table, int write, |
446 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
447 | { | |
448 | struct ctl_table t; | |
449 | unsigned long cap_array[_KERNEL_CAPABILITY_U32S]; | |
450 | kernel_cap_t new_cap; | |
451 | int err, i; | |
452 | ||
453 | if (write && (!capable(CAP_SETPCAP) || | |
454 | !capable(CAP_SYS_MODULE))) | |
455 | return -EPERM; | |
456 | ||
457 | /* | |
458 | * convert from the global kernel_cap_t to the ulong array to print to | |
459 | * userspace if this is a read. | |
460 | */ | |
461 | spin_lock(&umh_sysctl_lock); | |
462 | for (i = 0; i < _KERNEL_CAPABILITY_U32S; i++) { | |
463 | if (table->data == CAP_BSET) | |
464 | cap_array[i] = usermodehelper_bset.cap[i]; | |
465 | else if (table->data == CAP_PI) | |
466 | cap_array[i] = usermodehelper_inheritable.cap[i]; | |
467 | else | |
468 | BUG(); | |
469 | } | |
470 | spin_unlock(&umh_sysctl_lock); | |
471 | ||
472 | t = *table; | |
473 | t.data = &cap_array; | |
474 | ||
475 | /* | |
476 | * actually read or write and array of ulongs from userspace. Remember | |
477 | * these are least significant 32 bits first | |
478 | */ | |
479 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); | |
480 | if (err < 0) | |
481 | return err; | |
482 | ||
483 | /* | |
484 | * convert from the sysctl array of ulongs to the kernel_cap_t | |
485 | * internal representation | |
486 | */ | |
487 | for (i = 0; i < _KERNEL_CAPABILITY_U32S; i++) | |
488 | new_cap.cap[i] = cap_array[i]; | |
489 | ||
490 | /* | |
491 | * Drop everything not in the new_cap (but don't add things) | |
492 | */ | |
493 | spin_lock(&umh_sysctl_lock); | |
494 | if (write) { | |
495 | if (table->data == CAP_BSET) | |
496 | usermodehelper_bset = cap_intersect(usermodehelper_bset, new_cap); | |
497 | if (table->data == CAP_PI) | |
498 | usermodehelper_inheritable = cap_intersect(usermodehelper_inheritable, new_cap); | |
499 | } | |
500 | spin_unlock(&umh_sysctl_lock); | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
505 | struct ctl_table usermodehelper_table[] = { | |
506 | { | |
507 | .procname = "bset", | |
508 | .data = CAP_BSET, | |
509 | .maxlen = _KERNEL_CAPABILITY_U32S * sizeof(unsigned long), | |
510 | .mode = 0600, | |
511 | .proc_handler = proc_cap_handler, | |
512 | }, | |
513 | { | |
514 | .procname = "inheritable", | |
515 | .data = CAP_PI, | |
516 | .maxlen = _KERNEL_CAPABILITY_U32S * sizeof(unsigned long), | |
517 | .mode = 0600, | |
518 | .proc_handler = proc_cap_handler, | |
519 | }, | |
520 | { } | |
521 | }; | |
522 | ||
1da177e4 LT |
523 | void __init usermodehelper_init(void) |
524 | { | |
525 | khelper_wq = create_singlethread_workqueue("khelper"); | |
526 | BUG_ON(!khelper_wq); | |
527 | } |